1. Brigham and Women’s Hospital Heart & Vascular Center, Harvard Medical School, Boston, MA (R.K.W., D.L.B.)
2. Division of Cardiology, Richard and Susan Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical and Harvard Medical School, Boston, MA (R.K.W.)
3. Division of Cardiology, Washington University School of Medicine, Saint Louis, MO (K.E.J.M.)
4. The Ahmanson-UCLA (University of California, Los Angeles) Cardiomyopathy Center, Ronald Reagan UCLA Medical Center (G.C.F.)
5. Duke Clinical Research Institute, Durham, NC (X.Z., A.D.D., R.A.M., A.F.H.)
6. Division of Cardiology, Stanford University, Palo Alto, CA (P.A.H.)
7. Department of Biostatistics and Bioinformatics, Duke University, Durham, NC (R.A.M.)
8. Division of Cardiology, Feinberg School of Medicine, Northwestern University, Chicago, IL (C.W.Y.).